That’s the first line of the Show HN rules.
https://news.ycombinator.com/showhn.html
This is just a blog post, and thus a regular submission and explicitly off-topic for Show HN. Everyone clicking on this will be disappointed, as demonstrated by the comments so far. There isn’t even a video for us to see the effect.
I think the HN algo rewards posts with a high points to comments ratio anyway which is a good thing in this case.
Now I read it and find it weird. The core detail how 2 small noisy wifi chips would achieve a 90% detection rate is completely unexplained.
The amount of data they get is minimal too, sounds more like voodoo than real